mtd: spi-nor-ids: Add SECT_4K to mt25qu512a

The mt25qu512a supports 4K or 64K sectors, so adding
SECT_4K to enable 4K sector usage.

Tested on Intel n5x hardware with QSPI carrier card

Signed-off-by: Kris Chaplin <kris.chaplin@linux.intel.com>
Acked-by: Pratyush Yadav <p.yadav@ti.com>
[jagan: droped Tested-by of patch author and datasheet link]
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>